Physically-crosslinked anion exchange membranes by blending ionic additive into alkyl-substituted quaternized PPO

Title
Physically-crosslinked anion exchange membranes by blending ionic additive into alkyl-substituted quaternized PPO
Authors
김형준채지언Boryeon LeeHaeryang LimTae-Hyun Kim
Keywords
Anion exchange membranes; Physically-crosslinked system; Ion conductivity
Issue Date
2019-03
Publisher
Journal of membrane science
Citation
VOL 574-43
Abstract
An additive-induced physically crosslinked system for use as anion exchange membranes was developed by blending an additive (DHBQA) containing both long alkyl (C12, dodecyl) and quaternary ammonium groups into a dodecyl-substituted and quaternary ammonium-functionalized PPO (poly(2,6-dimethyl-1,4-phenylene oxide)) (C12-PPO-QA). The additive, whose diammonium groups act as ion conductors, and whose long alkyl chains bind to the alkyl chains of the C12-PPO-QA polymer through van der Waals interactions, induced the formation of ion clusters as well as physical crosslinking of the C12-PPO-QA polymer. Controlling the amount of additive to maximize its intermolecular interactions with the polymer resulted in a PPO-10.8 membrane (10.8  wt% of additive relative to polymer) with very high ion conductivities of 49.2 mS cm− 1 at 20  °C and 107.6 mS cm− 1 at 80  °C and low swelling ratios of 18.2% at 20  °C and 33.3% at 80  °C, as well as excellent mechanical and alkaline stability. The H2/O2 single cell performance using PPO-10.8 reached a maximum power density about 60  mW  cm− 2, higher than that of the PPO-0 sample.
URI
http://pubs.kist.re.kr/handle/201004/69182
ISSN
0376-7388
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